Part 3: World 3 — Diamond City: Power Star 3 (Wario)

World 3-1, Diamond City and its Academy, Ashley's House and the Nightmare quest. The game lets you take World 3 or World 4 first; the trainer sheet lists both orders and this guide shows the World-3-first teams by default.

World 3 — Diamond City: Power Star 3 (Wario) opens 6 areas. There are 43 trainers standing in them. The fights at this checkpoint are Wario, Koopa King Bowser, Antasma, and 4 more.

Where to go

1. Ashley's Mansion

   Wild: Boo 40% · Lv —, Ghost Mouse 40% · Lv —, Eerie 15% · Lv —, Duplighost 5% · Lv —

2. World 3-1

   Wild: Cataquack 30% · Lv —, Gushen 30% · Lv —, Strollin' Stu 30% · Lv —, Minion 20% · Lv — +2 more

   Trainers: Noki Peridotite Lv 15, Pianta Granite Lv 15, Sailor Tourmaline Lv 12, Pianta Apatite Lv 17, Toad Serpentine Lv 16, ★ Admin Kamek Lv 23 +5 more

   Pick up: TM45 Imprison, Big Pearl (hidden — beach rock), Heart Scale (hidden — beach rock), Helmet Cap (hidden — bush near the kart toad), Pearl (hidden — beach rock), Scuba Cap (hidden — beach rock), Shell Bell (hidden — beach rock)

3. Diamond City Academy

   Wild: Birdo Lv —

   Trainers: Toadsworth (Wild Battle) Lv 33, Toadsworth (High Level Battle) Lv 46

4. Diamond City

   Wild: Gushen 30% · Lv —

   Trainers: Jimmy T. Lv 22, Penny Lv 21, Lady Teacher Lv 20, Toadsworth (Hidden Ability) Lv 18, Pokemon Trainer Red Lv 21, ★ Wario Lv 24 +10 more

   Pick up: TM18 Light Screen, TM19 Reflect, TM20 Safeguard, TM22 Rest, TM25 Snore, TM26 Protect, TM30 Frustration, TM31 Steel Wing +1 more

5. Ashley's House

   Trainers: Shaman Neville Lv 19, Shaman Lydia Lv 15, Shaman Chauncey Lv 20, Ashley Lv 22, Shaman Neville Lv 23, Shaman Lydia Lv 20 +2 more

6. Nightmare

   Trainers: Cabinet Lv 27, ★ Koopa King Bowser Lv 26, ★ Antasma Lv 30, Cabinet Lv 20, ★ Koopa King Bowser Lv 23, ★ Antasma Lv 25

★ Wario — Diamond City

4 Pokémon · level cap Lv 24 (every cap) · Wario’s own page

	Pokémon	Moves
	Bandit Lv 22 · Pickpocket · Light Ball Jolly nature · IVs 8 HP / 6 Atk	Fake Out Fling Thief Covet
	Phanto Lv 23 · Infiltrator Impish nature · IVs 8 HP / 6 Atk	Draining Kiss Pursuit Astonish Quick Attack
	Buzzy Beetle Lv 23 · Quick Feet IVs 8 HP / 6 Atk	Curse Metal Claw Knock Off
	Pyoro Lv 24 · Super Luck · Oran Berry Timid nature	Lick Gust Pursuit Wrap

★ Koopa King Bowser — Nightmare

1 Pokémon · level cap Lv 26 (every cap) · Koopa King Bowser’s own page

	Pokémon	Moves
	Bowser Lv 26 · Shell Armor IVs 4 HP / 3 Atk	Incinerate Dragon Breath Crush Claw Withdraw

★ Antasma — Nightmare

1 Pokémon · level cap Lv 30 (every cap) · Antasma’s own page

	Pokémon	Moves
	Antasma Lv 30 · Bad Dreams · Sitrus Berry	Foul Play Feint Attack Nightmare Haze

Also fought around here

Everything you can have caught by this checkpoint · Open the interactive guide

It also doesn't say when Every fishing spot, Nature Reserve open up, so they are in no part above; each has its own route page.